Knowledge
Axiography and EMG (Electromyography) |
Axiography
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Pict.: 1 - Axiography
(Photo: zebris Medical GmbH) |
In cases with severe jaw symtoms associated with malpositioned teeth axiography is needed for treatment design, documentation, progress, evaluation and quality management.
A specific diagnosis can be made by recording the movement of the lower jaw.This is done while recording the movement with ultrasound in a short period of time.
Starting point is the so called face bow (Pict. 1) which is mounted easily on the head. Related to the face bow is a fork on the lower arch attached to the outside side of the lower teeth.
Ultrasonic sensors record the data of all the movements of the lower jaw. Using the differential patterns of movements conclusions of possible functional disorders can be made
EMG (Electromyography)
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Pict.: 2 - EMG (Electromyography)
(Photo: zebris Medical GmbH) |
The movement of the lower jaw is performed by the chewing muscles. The function of these muscles can be recorded using EMG (Pict.: 2).
EMG is an illustration of the deduction of bioelectrical signals from the muscles.
Functional disorders of the muscles present symptomatic changes in the recording, referring to resting position, capability to contract ( capability to function) and exhaustibility.
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